Using the current method, skin samples are grown from tissues donated by plastic surgery patients in France are then cut into thin slices and broken down into cells. Those cells are placed in trays, fed a special, proprietary diet, and exposed to biological signals that mimic those of actual skin. "We create an environment that's as close as possible to being inside someone's body," says Balooch. It takes about a week for the samples to form, he adds, "because the skin has different layers and you have to grow them in succession."
For the full story: http://www.northjersey.com/news/business/l-oreal-s-plan-to-start-3d-printing-human-skin-1.1337020